BR112019020630A2 - communications method for sending a dmrs demodulation reference signal, communication method for obtaining a dmrs demodulation reference signal, indication method, communications method for determining a time-frequency resource, communications apparatus for sending a signal dmrs demodulation reference, communications device to obtain a dmrs demodulation reference signal, indicating device, communications device to determine a time-frequency resource, computer storage medium - Google Patents

Abstract

The modalities of this application disclose a method and apparatus for transmitting a DMR, and are related to the field of communications technologies. the method and apparatus are applicable to a nr system. the method for transmitting a dmrs may include: determining a time-frequency resource used to transport a dmrs; and then send the dmrs using the time-frequency feature.

Description

COMMUNICATION METHOD TO SEND A DMRS DEMODULATION REFERENCE SIGN, COMMUNICATION METHOD TO OBTAIN A

DMRS DEMODULATION REFERENCE SIGNAL, INDICATION METHOD, COMMUNICATIONS METHOD TO DETERMINE A TIME-FREQUENCY RESOURCE, COMMUNICATIONS DEVICE TO SEND A DMRS DEMODULATION REFERENCE SIGN, COMMUNICATIONS DEVICE TO OBTAIN A REFERENCE SIGNAL, REFERENCE SIGNAL INDICATION, communications apparatus for determining a TEMPOFREQUÊNCIA feature COMPUTER STORAGE MEDIA [001] This application claims priority to Chinese Patent application No. 201710214876.X, filed in Chinese Patent Office I in ^the April 2017, and entitled METHOD AND APPARATUS FOR TRANSMITTING DMRS, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD [002] Modalities of this application refer to the field of communication technologies and, in particular, to a method and apparatus for transmitting a demodulation reference signal, DMRS.

FUNDAMENTALS [003] In an existing long term evolution pattern (LTE), multiple inputs and multiple outputs (mlti-input mlti-output, MIMO) from single user (single user, SU) supports multiplexing to a maximum eight layers of orthogonal DMRS doors, and one DMRS occupies 24 REs. Specifically, DMRS ports can be mapped to a subcarrier 0, a subcarrier 1, a subcarrier 5, a subcarrier 6, a subcarrier 10 and a subcarrier 11 of each resource block pair (RB) in the

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2/136 frequency domain, and DMRS ports can be mapped to a symbol 5, a symbol 6, a symbol 12, and a symbol 13 of each subframe in the time domain, as shown in Figure 1 [004] The technical solution above is not applicable to a new radio system (new radio, NR). For example, a DMRS at LTE is placed in the middle or at the rear of each subframe. A receiving terminal must receive all DMRSs before performing data demodulation. Consequently, a requirement for rapid demodulation of NR data cannot be satisfied.

SUMMARY [005] This application provides a method and apparatus for transmitting a DMRS, which are applicable to an NR system.

[006] According to a first aspect, this application provides a method and apparatus for determining a time-frequency resource used to transport a DMRS.

[007] In a possible project, the method may include: determining a time-frequency resource used to transport a DMRS. For a related description of the time-frequency feature, see the following descriptions.

[008] Correspondingly, this request also provides the apparatus for determining a time-frequency resource used to transport a DMRS. The device can implement the method for determining a time-frequency resource used to transport a DMRS. For example, the device can be a chip (for example, a baseband chip or a communication chip) or a transmission end (for example, a base station or terminal). The device can implement

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3/136 the previous method using software or hardware or using hardware running corresponding software.

[009] In a possible project, the device can include a processor and a memory. The processor is configured to support the apparatus in performing corresponding functions in the previous method to determine a temperature frequency resource used to transport a DMRS. The memory is configured to be coupled to the processor, and to store a program (an instruction) and data necessary for the device. Optionally, the device can also include a communication interface, configured to support communication between the device and another network element. The communication interface can be a transceiver.

[0010] In another possible project, the device may include: a determination unit, configured to determine a time-frequency resource used to transport a DMRS. For a related description of the time-frequency feature, see the following descriptions.

[0011] According to a second aspect, this application provides a method and an apparatus for sending a DMRS.

[0012] In a possible project, the method may include: determining a time-frequency resource used to transport a DMRS; and, then, send the DMRS by using the time-frequency resource, that is, determine the time-frequency resource used to transport the DMRS, and then send the DMRS by using the determined time-frequency resource.

[0013] In a possible project, the DMRS is transported in at least one resource unit; and if a total amount

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4/136 of DMRS ports supported by the system is 6, in each resource unit, a time-frequency resource occupied by the DMRS includes a first symbol in the time domain, and includes any of the following sub-carriers in the frequency domain: a sub-carrier 6n, a 6n + 1 subcarrier, a 6n + 2 subcarrier, a 6n + 3 subcarrier, a 6n + 4 subcarrier and a 6n + 5 subcarrier, where n can be one or more integers greater than or equal to 0 and less than / 6J. For a specific example and a related description, see (a) in Figure 7. It can be understood that the DMRS here is a reference signal; the time-frequency resource used to transport a DMRS can be understood as an RE that is in one or more resource units and that is used to transport the DMRS; and the time-frequency resource occupied by the DMRS in each resource unit is an RE that is in a resource unit and which is used to transport the DMRS. These terms in the following examples have similar meanings as those described above, and therefore, details are not described.

[0014] In a possible project, the DMRS is transported in at least one resource unit; and if a total number of DMRS ports supported by the system is 6, the six DMRS ports are divided into three groups of DMRS ports, and the same time-frequency feature is multiplexed to DMRS ports in each DMRS port group in a way to CDM, in each resource unit, a DMRS-occupied time-frequency resource includes a first symbol in the time domain, and includes any of the following subcarriers in the frequency domain: a 3n subcarrier, a 3n + 1 subcarrier and a subcarrier 3n + 2, where

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5/136 n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J; and for a specific example and a related description thereof, reference can be made to (a) in Figure 8.

[0015] In a possible project, the DMRS is transported in at least one resource unit; and if the total number of DMRS ports supported by the system is 6, in each resource unit, a DMRS-occupied time-frequency resource has one of the following resources:

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain;

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain;

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the

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6/136 time domain, the time-frequency resource includes a 6n + 5 subcarrier of the resource unit in the frequency domain;

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by the DMRS is a second symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain;

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain; or when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 6n + 5 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain, where n can be any one or more numbers integers greater than or equal to 0 and less than \ _M / 6j; and for a specific example and a related description of it, reference can be

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7/136 made to (c) in Figure 11.

[0016] In a possible project, the DMRS is transported in at least one resource unit; and if a total number of DMRS ports supported by the system is 6, the six DMRS ports are divided into three groups of DMRS ports, and the same time-frequency feature is multiplexed to DMRS ports in each DMRS port group in a way to CDM, in each resource unit, a time-frequency resource occupied by DMRS has one of the following resources:

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain;

when the time-frequency resource occupied by DMRS is a first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain; and when the DMRS-occupied time-frequency resource is a second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; or when the DMRS-occupied time-frequency resource is a first symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain; and when the time-frequency resource occupied by DMRS is a second symbol in the

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8/136 time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain, where n can be any one or more integers greater than or equal to 0 and less than \ _M / 3j ; and for a specific example and a related description thereof, reference can be made to (c) in Figure 12.

[0017] It can be understood that the previous one lists characteristics of a time-frequency resource occupied by a DMRS in different situations. During specific implementation, for resources in other examples below, refer to resources of a time-frequency resource occupied by a DMRS in other situations in the previous way, and characteristics of time-frequency resources occupied by a plurality of DMRSs can be inferred based on characteristics. The details are not described here.

[0018] Correspondingly, this request also provides the device to send a DMRS. The apparatus can implement the method for sending a DMRS according to the second aspect. For example, the device can be a transmission end (for example, a base station or a terminal), and it can implement the previous method using software or hardware or using hardware running corresponding software.

[0019] In a possible project, the device can include a processor and a memory. The processor is configured to support the device in performing corresponding functions in the method according to the second aspect. The memory is configured to be coupled to the processor, and to store a program (an instruction) and necessary data

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9/136 for the device. Optionally, the device can also include a communication interface, configured to support communication between the device and another network element. The communication interface can be a transceiver.

[0020] In another possible project, the device may include a determination unit and a sending unit. The unit of determination is configured to determine a time-frequency resource used to transport a DMRS. The sending unit is configured to send the DMRS using the time-frequency feature.

[0021] According to a third aspect, this application provides a method and an apparatus for obtaining a DMRS.

[0022] In a possible project, the method may include: determining a time-frequency resource used to transport a DMRS; and then obtain the DMRS by using the time-frequency resource.

[0023] Correspondingly, this request also provides the device to obtain a DMRS. The apparatus can implement the method for obtaining a DMRS according to the third aspect. For example, the device can be a receiving end (for example, a base station or a terminal) and can implement the previous method using software or hardware or using hardware running corresponding software.

[0024] In a possible project, the device can include a processor and a memory. The processor is configured to support the device in performing corresponding functions in the method according to the third aspect. The memory is configured to be coupled to the processor, and to store a program (an instruction) and data necessary for the device. Optionally, the device can also include

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10/136 a communication interface, configured to support the communication between the device and another network element. The communication interface can be a transceiver.

[0025] In another possible project, the device may include a determination unit and a obtaining unit. The unit of determination can be configured to determine a time-frequency resource used to transport a DMRS. The procurement unit can be configured to obtain the DMRS by using the time-frequency feature.

[0026] According to a fourth aspect, this application provides a method and apparatus for indicating.

[0027] In a possible project, the method may include: generating indication information, where indication information is used to indicate a time-frequency resource used to transport a DMRS; and then send the referral information. The method can be performed by a base station. Optionally, indication information can be information used to indicate a pilot pattern, for example, an index of a pilot pattern, and is used to instruct a terminal to determine a pilot pattern used by the base station in a current scheduling process. This optional implementation is applicable to a scenario where a plurality of pilot patterns can be used during communication between the base station and the terminal. Optionally, referral information can be information used to indicate a DMRS port, for example, a DMRS port identifier (for example, a DMRS port number), and is used to instruct a terminal to determine a DMRS port allocated by the station basis for the terminal in a current escalation process. This optional implementation is applicable to a scenario where one or

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11/136 more pilot patterns can be used when communicating between the base station and the terminal.

[0028] Correspondingly, this request also provides the device to send a DMRS. The device can implement the display method according to the fourth aspect. For example, the device can be a base station, and can implement the previous method using software or hardware or using hardware running corresponding software.

[0029] In a possible project, the device can include a processor and a memory. The processor is configured to support the device in performing corresponding functions in the method according to the fourth aspect. The memory is configured to be coupled to the processor, and to store a program (an instruction) and data necessary for the device. Optionally, the device can also include a communication interface, configured to support communication between the device and another network element. The communication interface can be a transceiver.

[0030] In another possible project, the device can include a generation unit and a shipping unit. The generation unit is configured to generate indication information, where indication information is used to indicate a time-frequency resource used to transport a DMRS. The sending unit is configured to send the indication information.

[0031] According to a fifth aspect, this application provides a method and an apparatus for determining a time-frequency resource.

[0032] In a possible project, the method may include: receiving referral information, where information from

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12/136 indication is used to indicate a time-frequency resource used to transport a DMRS; and then determine, based on the indication information, the time-frequency resource used to transport the DMRS.

[0033] Correspondingly, this request also provides the device to obtain a DMRS. The apparatus can implement the method for determining a time-frequency resource according to the fifth aspect. For example, the device can be a terminal, and it can implement the previous method using software or hardware or using hardware running corresponding software.

[0034] In a possible project, the device can include a processor and a memory. The processor is configured to support the device in performing corresponding functions in the method according to the fifth aspect. The memory is configured to be coupled to the processor, and to store a program (an instruction) and data necessary for the device. In addition, the device may also include a communication interface, configured to support communication between the device and another network element. The communication interface can be a transceiver.

[0035] In another possible design, the device can include a receiving unit and a determining unit. The receiving unit is configured to receive referral information, where referral information is used to indicate a time-frequency resource used to transport a DMRS. The determination unit is configured to determine, based on the indication information, the time-frequency resource used to transport the DMRS.

[0036] This application also provides a means of storage

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13/136 computer. The computer storage medium stores a computer program (an instruction). When the program (instruction) is executed on a computer, the computer executes the method according to any of the previous aspects.

[0037] This application also provides a computer program product. When the computer program product is run on a computer, the computer executes the method according to any of the above.

[0038] The time-frequency resources provided above used to transport the DMRS have a mapping relationship with the DMRS port. Therefore, this request also provides several mapping rules between a DMRS port and a time-frequency resource. For a detailed description of each rule and analysis of a beneficial effect of the rule, refer to the following specific implementations. The details are not described here.

[0039] It can be understood that any of the apparatus, computer storage medium, or computer program product provided above is configured to execute the corresponding method provided above. A beneficial effect that can be achieved by using the method provided above is related to the mapping relationship between a time-frequency resource used to transport a DMRS port and a DMRS port. Therefore, for a beneficial effect that can be achieved by devices, a computer storage medium, or a computer program product, refer to a beneficial effect of a corresponding solution in the following specific implementations. The details are not described here.

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14/136

BRIEF DESCRIPTION OF THE DRAWINGS [0040] Figure 1 is a schematic diagram of a pilot pattern according to the prior art;

Figure 2 is a schematic diagram of a resource unit according to an embodiment of this application;

Figure 3 is a schematic diagram of a system architecture in which a technical solution is applied according to one embodiment of this application;

Figure 4 is a schematic structural diagram of a base station according to an embodiment of this application;

Figure 5 is a schematic structural diagram of a terminal according to an embodiment of this application;

Figure 6 is a schematic interaction diagram of a method for transmitting a DMRS according to an embodiment of this application;

Figure 6a is a schematic interaction diagram of another method for transmitting a DMRS according to an embodiment of this request;

Figure 7 is a schematic diagram of a pilot pattern for six doors according to one embodiment of this order;

Figure 8 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 9 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 10 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 11 is a schematic diagram of another pattern

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15/136 pilot for six doors according to one modality of this request;

Figure 12 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 13 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 14 is a schematic diagram of another pilot pattern for six doors according to one embodiment of this order;

Figure 15 is a schematic diagram of a pilot pattern for eight doors according to one embodiment of this order;

Figure 16 is a schematic diagram of another pilot pattern for eight doors according to one embodiment of this order;

Figure 17 is a schematic diagram of another pilot pattern for eight doors according to one embodiment of this order;

Figure 18 is a schematic diagram of another pilot pattern for eight doors according to one embodiment of this order;

Figure 19 is a schematic diagram of a pilot pattern for 12 doors according to one embodiment of this order;

Figure 20 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 21 is a schematic diagram of another pilot pattern for 12 doors according to an embodiment of this order;

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Figure 22 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 23 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 24 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 25 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 26 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 27 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 28 is a schematic diagram of another pilot pattern for 12 doors according to one embodiment of this order;

Figure 29 is a schematic diagram of a pilot pattern for 16 doors according to an embodiment of this order;

Figure 30 is a schematic diagram of another pilot pattern for 16 doors according to one embodiment of this order;

Figure 31 is a schematic diagram of another pilot pattern for 16 doors according to an embodiment of this order;

Figure 32 is a schematic diagram of another pattern

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pilot for 16 doors according to a modality this order; The figure 33 is a schematic diagram from another standard pilot for 16 doors according to a modality this order; The figure 34 is a schematic diagram from another standard pilot for 16 doors according to a modality this order; The figure 35 is a schematic structural diagram on one

apparatus for sending a DMRS according to an embodiment of this request;

Figure 36 is a schematic structural diagram of an apparatus for obtaining a DMRS according to an embodiment of this application;

Figure 37 is a schematic structural diagram of an indicating apparatus according to an embodiment of this application;

Figure 38 is a schematic structural diagram of an apparatus for determining a time-frequency resource according to an embodiment of this request; and

Figure 39 is a schematic structural diagram of an apparatus for transmitting a DMRS according to an embodiment of this application.

DESCRIPTION OF THE MODALITIES [0041] First, terms related to this specification are briefly described to help a reader to have a better understanding.

(1) Resource unit [0042] Similar to an RB and RB pair (RB pair) in the LTE standard, a resource unit is provided in some

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18/136 modalities of this request. The resource unit can be used as a basic unit to scale a terminal to perform resource allocation, or it can be used to describe a way of arranging a plurality of reference signals.

[0043] The resource unit may include a plurality of consecutive subcarriers in the frequency domain and a time interval (TI) in the time domain. In different scheduling processes, resource unit sizes can be the same or different. The TI here can be a transmission time interval (TTI) in an LTE system, a short symbol level TTI, a short TTI of a large subcarrier spacing in a high frequency system, an interval or a mini-slot on a 5G or similar system. This is not limited in this order.

[0044] Optionally, a resource unit can include one or more RBs, one or more pairs of RBs, or the like, or it can be half of an RB or the like. Alternatively, a resource unit can be another time-frequency resource. This is not limited in this order. A pair of RBs includes 12 consecutive subcarriers in the frequency domain and a subframe in the time domain. A time-frequency resource that includes a sub-carrier in the frequency domain and a symbol in the time domain is a resource element, as shown in Figure 2. A pair of RBs in Figure 2 includes 12 consecutive sub-carriers (numbered from 0 to 11) in the frequency domain and 14 symbols (numbered from 0 to 13) in the time domain. In Figure 2, a horizontal coordinate axis indicates a domain

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19/136 of time and a vertical coordinate axis indicates a frequency domain. It should be noted that the accompanying drawings that are included in this application and that indicate a resource in the time-frequency domain are described using the pair of RBs shown in Figure 2 as an example. A person skilled in the art can understand that this is not limited during the specific implementation. It may be understood that a symbol in this application may include, among others, any of the following: an orthogonal frequency division multiplexing (OFDM) symbol, a universal filtered multi-carrier signal carrier, UFMC), a filter-bank multi-carrier symbol (FBMC), a symbol for generalized frequency division multiplexing (GFDM) and the like.

(2) DMRS port group [0045] A DMRS port group in this application is a logical concept introduced to clearly describe the technical solutions provided in this application, and specifically, it is a logical concept introduced to clearly describe a pilot pattern or a variation of pilot pattern provided in this order. It can be understood that during the actual implementation, a base station and a terminal may not perform a DMRS port grouping action. Any way used to design the pilot pattern or the variation of the pilot pattern described in this order must be within the scope of protection of this order.

[0046] A group of DMRS ports can include one or more DMRS ports. In this order, the same time resource

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20/136 frequency is multiplexed for DMRSs corresponding to ports in a DMRS port group in a CDM (code division multiplexing) manner, for example, using a method such as orthogonal cover code, OCC, bypass cyclic shift, CS or cyclic phase rotations. A technical solution in which a time-frequency resource is multiplexed to a plurality of reference signals in a CDM manner has been clearly described in the prior art. The details are not described in this specification.

(3) DMRS port supported by the system [0047] A DMRS port supported by the system can be considered as a DMRS port that can be used by a base station. During actual implementation, the base station can scale the terminal using some or all of the DMRS ports supported by the base station. In this order, a number of DMRS ports supported by the system is 6, 8, 12 or 16 is used as an example for description.

(4) Other terms [0048] The term a plurality of in this specification means at least two.

[0049] The terms first, second and so on in this specification are merely used to differentiate between different objects, but are not intended to limit a sequence of terms. For example, a first group of symbols and a second group of symbols are used only to differentiate groups of different symbols, but are not intended to limit a sequence of groups of symbols.

[0050] The term and / or in this specification describes only an association relationship to describe objects

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21/136 associated and represents that three relationships can exist. For example, A and / or B can represent the following three cases: Only A exists, A and B exist and only B exists. In addition, the / character in this specification generally indicates a relationship or between associated objects.

[0051] The technical solutions provided in this application are described below with reference to the attached drawings.

[0052] The technical solutions provided in this application can be applied to various communication systems, for example, current 2G, 3G and 4G communication systems and an evolved future network, such as a 5G communications system. For example, communications systems can be an LTE system, a cellular system related to a third generation partnership project (3rd Generation Partnership Project, 3GPP), and other communications systems. In particular, technical solutions can be applied to a 5G NR system. It should be noted that a 5G standard can include scenarios such as machine to machine (machine to machine, M2M), D2M, macro-micro communication, enhanced mobile broadband (eMBB), ultra reliable low latency communications (ultra reliable & low latency communication, uRLLC) and massive Internet type of communication (mMTC). These scenarios may include, but are not limited to, a communication scenario between terminals, a communication scenario between peers, a communication scenario between a base station and a terminal and the like. The technical solutions provided in the modalities of this order can also be applied to a scenario of communication between terminals, communication between peers in a system

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22/136 of 5G communications.

[0053] The technical solutions provided in the modalities of this order can be applied to a system architecture shown in Figure 3. The system architecture can include a base station 100 and one or more terminals 200 connected to base station 100.

[0054] In one example, base station 100 can be implemented using a structure shown in Figure 4.

[0055] Base station 100 can be a device that can communicate with terminal 200. Base station 100 can be a relay station, an access point or the like. The base station 100 can be a base transceiver station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communication, GSM) or a code division multiple access network, CDMA ), can be an NB (NodeB) in multiple access by broadband code division (wideband code division multiple access, WCDMA), or it can be an eNB or eNóB (evolutionary NodeB) in LTE. Alternatively, base station 100 can be a radio controller in a cloud radio access network (CRAN) scenario. Alternatively, the base station 100 can be a network device on a future 5G network or a network device on a future evolved PLMN network, or it can be a wearable device, a device in the vehicle or the like.

[0056] The terminal 200 can be user equipment (user equipment, UE), an access terminal, an UE unit, an UE station, a mobile station, a mobile console, a mobile station, a remote station, a remote terminal,

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23/136 a mobile device, an EU terminal, a terminal, a wireless communications device, an EU agent, an EU device or the like. The access terminal can be a cell phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop station (wireless local loop, WLL), a personal digital assistant (personal digital assistant, PDA), a portable device having a wireless communication function, a computing device, another processing device connected to a wireless modem, a device in the vehicle, a wearable device, a terminal on a network 5G future, a terminal on a future evolved PLMN network or the like.

[0057] A general purpose hardware architecture of base station 100 is described. As shown in Figure 4, the base station can include a building baseband unit (BBU) and a remote radio unit (RRU). The RRU is connected to an antenna system (ie, an antenna), and the BBU and RRU can be used separately based on a requirement. It should be noted that, in a specific implementation process, the base station 100 may alternatively use another general purpose hardware architecture and is not limited to the general purpose hardware architecture shown in Figure 4.

[0058] For example, terminal 200 is a mobile phone, and a general purpose hardware architecture of the mobile phone is described. As shown in Figure 5, the mobile phone can include components such as a radio frequency circuit (radio frequency, RF) 110, a memory 120, another

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24/136 input device 130, a display 140, a sensor 150, an audio circuit 160, an I / O subsystem 170, a processor 180 and a power source 190. One skilled in the art may understand that a structure of the cell phone shown in Figure 5 does not constitute any limitation on the mobile phone, and the mobile phone may include more or less components than shown in Figure 5. Some components can be combined, some components can be disassembled, or some components can be arranged in different ways. A person skilled in the art can understand that display 140 belongs to a user interface (user interface, UI), and display 140 may include a display panel 141 and a touch panel 142. In addition, the mobile phone may include more or less components than shown in Figure 5. The mobile phone can also include function modules or devices such as a camera and a Bluetooth module, which are not shown in Figure 5. Details are not described here.

[0059] In addition, processor 180 is connected separately to RF circuit 110, memory 120, audio circuit 160, I / O subsystem 170 and power source 190. I / O subsystem 170 is connected separately to another input device 130, display 140 and sensor 150. RF circuit 110 can be configured to: receive or send a signal in a process of receiving or sending information or in a calling process. In particular, after receiving downlink information from the base station, RF circuit 110 sends the downlink information to processor 180 for processing. Memory 120 can be configured to

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25/136 store a program and software module. The processor 180 processes various functional applications and data from the mobile phone by executing the program and the software module that are stored in memory 120. Another input device 130 can be configured to: receive information of entered digits or characters, and generate signal input related to a user configuration and mobile phone function control. Display 140 can be configured to display information entered by a user or information provided to a user, and various mobile phone menus, and can receive user input. The sensor 150 can be an optical sensor, a motion sensor or another sensor. The audio circuit 160 can provide an audio interface between a user and the mobile phone. The I / O subsystem 170 is configured to control a peripheral device that is configured to perform input and output, and the peripheral device can include another device input controller, a sensor controller and a display controller. Processor 180 is a mobile phone control center 200, and is connected to all parts of the entire mobile phone using various interfaces and lines. Processor 180 performs various functions of the mobile phone 200 and processes data by running or executing the software program and / or module that is / is stored in memory 120 and by invoking the data stored in memory 120, to perform global monitoring on the phone mobile. Power source 190 (for example, a battery) is configured to supply power to all previous components. The power supply can be logically connected to the processor 180 using a power source management system, for

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26/136 implement functions such as load and discharge management and energy consumption management by using the power source management system.

[0060] The technical solutions provided in this application can be used in a single carrier transmission scenario or a multi-carrier transmission scenario, and can be applied to an uplink transmission scenario or a downlink transmission scenario.

[0061] The following describes a method for transmitting a DMRS provided in this application. The method for transmitting a DMRS can include a method for sending a DMRS through a transmitting end and a method for obtaining a DMRS through a receiving end.

[0062] Figure 6 shows a method for transmitting a DMRS provided in this application. The method can include the following steps:

5101. A transmission end determines a time-frequency resource used to transport a DMRS.

[0063] The DMRS is transported in at least one resource unit. For a DMRS-occupied temperature-frequency feature in each resource unit, refer to any DMRS-occupied temperature-frequency feature in any of Figure 7 to Figure 34 and related descriptions in Figure 7 to Figure 34.

5102. The transmission end sends the DMRS by using the time-frequency feature.

5103. A receiving end determines the time-frequency resource used to transport the DMRS.

5104. The receiving end obtains the DMRS by using the

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27/136 determined time-frequency resource.

[0064] The time-frequency resource used to transport the DMRS can include one or more symbols in the time domain or can include one or more subcarriers in the frequency domain. When the time-frequency resource includes a plurality of symbols in the time domain, the plurality of symbols can be a plurality of consecutive or discrete symbols. When the time-frequency resource includes a plurality of subcarriers in the frequency domain, the plurality of subcarriers can be a plurality of consecutive or discrete subcarriers. This is not limited in this order. After S101 and before S102, the method may also include: mapping, at the transmission end, the DMRS to the determined time-frequency resource. For a related description of the time-frequency feature and a beneficial effect that can be achieved, see the following descriptions.

[0065] If the technical solution is applied to an uplink transmission scenario, the transmission end can be a terminal, and the receiving end can be a base station. If the technical solution is applied to a downlink transmission scenario, the transmission end can be a base station, and the receiving end can be a terminal.

[0066] Figure 6a shows another method for transmitting a DMRS provided in this application. The method can include the following steps:

S201. A base station generates referral information, where referral information is used to indicate a time-frequency resource used to transport a DMRS.

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28/136

5202. The base station sends the indication information to a terminal.

5203. The terminal receives the indication information, and determines, based on the indication information, the time-frequency resource used to transport the DMRS.

5204. The terminal obtains the DMRS by using the determined time-frequency resource.

[00 67] A DMRS port corresponds to a DMRS, and a DMRS can be transported in one or more REs. In one aspect, a mapping rule that is between a DMRS port and a time-frequency resource and that is used by the base station and the terminal can be fixed or can be adjusted semi-statically or dynamically. In another aspect, a DMRS port allocated by the base station to the terminal can be adjusted semi-statically or dynamically. Based on one of two aspects, during semi-static or dynamic adjustment, an even end can be notified using an instruction. The instruction (that is, the indication information) can include, among others, any of the following options: radio resource control signaling (RRC), media access control signaling, MAC), downlink control information, DCI and the like.

[0068] Optionally, the indication information may include DMRS port information, for example, a DMRS port number, and is used to indicate a temperature frequency resource corresponding to the DMRS port allocated by the base station to the terminal.

[00 69] According to the method for transmitting a DMRS provided in this application, an appropriate mapping rule

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29/136 between a DMRS port and a time-frequency resource is defined, so that the method can be applied to a complex and variable NR scenario.

[0070] Based on this, several mapping rules between a DMRS port and a time-frequency resource are still provided in this order. Before that, the following needs to be explained.

[0071] First, in this application, for easier description, the DMRS ports supported by the system can be numbered consecutively, for example, numbered consecutively from 1. For example, if a system supports six DMRS ports, the six DMRS ports will be indicated as DMRS ports 1 to 6. In this order, for ease of description, the symbols included in a resource unit are numbered consecutively from 0 in the time domain, and the subcarriers included in the resource unit are numbered from 0 in the frequency domain. For example, that a resource unit is a pair of RBs is used as an example. The pair of RBs can include symbols from 0 to 13 in the time domain and can include subcarriers from 0 to 11 in the frequency domain. This is certainly not limited during the specific implementation. It should be noted that the previous description is a configuration for ease of description of the technical solution provided in this modality of this order, but it is not intended to limit the scope of this order.

[0072] Second, a DMRS port can be mapped to one or more symbols of a resource unit. Optionally, each of the one or more symbols can be a front symbol, a middle symbol, or a TI back symbol. O

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30/136 frontal symbol is a symbol located in front of a TI, for example, it can correspond to a symbol numbered 2 (that is, a symbol 2) and / or a symbol numbered 3 (that is, a symbol 3) in a sub-frame in LTE. Which symbols in a subframe are specifically defined as front symbols is not limited in this application. Alternatively, each of the one or more symbols can be a middle symbol. The middle symbol is a symbol located in the middle of a subframe, for example, it can be a numbered 5 symbol (i.e., a 5 symbol) and / or a numbered 6 symbol (that is, a 6 symbol) in the subframe. Which symbols in a subframe are specifically defined as middle symbols is not limited in this order. Alternatively, each of the one or more symbols can be a back symbol. The rear symbol is a symbol located at the rear of a subframe, for example, it can be a numbered 9 symbol (ie a 9 symbol) and / or a numbered 10 symbol (ie a 10 symbol) in the subframe. Which symbols in a subframe are specifically defined as back symbols is not limited in this order. It can be understood that, during actual implementation, if a DMRS port is mapped to a plurality of symbols, the plurality of symbols can be different types of symbols, and the types of symbols include front symbols, middle symbols and rear symbols. For example, some of the plurality of symbols may be frontal symbols, and some other symbols are symbols of the middle.

[0073] Next, if a DMRS port is mapped to a symbol, the symbol will be referred to as a first symbol. If a DMRS port is mapped to a plurality of symbols,

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31/136 the plurality of symbols are two symbols that are respectively referred to as a first symbol and a second symbol is used as an example for description. The first symbol and the second symbol can be consecutive or discrete. In other words, the first symbol and the second symbol can be adjacent symbols or they can be non-adjacent symbols. In all the specific examples below, the first symbol and the second symbol are consecutive is used as an example for description. Specifically, the fact that the first symbol is a symbol numbered 2 in a subframe and the second symbol is a symbol numbered 3 in the subframe is used as an example description and this is not limited during an actual implementation.

[0074] It can be understood that the DMRS port here are all DMRS ports supported by the system. During actual implementation, whether all DMRS ports are used or part of all DMRS ports are used in an escalation process is not limited in this order.

[0075] It can be understood that, in this application, some or all DMRSs can be mapped to a frontal symbol. In this way, compared to the prior art, this request allows a receiving end to receive all DMRSs more quickly and initiate data demodulation. Therefore, a requirement for rapid demodulation of NR data can be satisfied.

[0076] Third, for a related description of a DMRS port group, see the previous descriptions. It should be noted that a specific implementation in which specific ports are used as a group of DMRS ports is not limited in this order. For example, if ports 1 through

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32/136 of the DMRS are divided into two groups, any four ports on the DMRS ports can be used as a group of DMRS ports and the other four ports will be used as a group of DMRS ports. In addition, different DMRS port groups do not include the same DMRS port. For another example, if DMRS ports 1 through 12 are divided into three groups, any four ports on the DMRS ports can be used as a DMRS port group, any four of the other eight DMRS ports will be used as a DMRS port group and then the remaining four ports are used as a DMRS port group.

[0077] Fourth, the following describes a plurality of mapping rules between a DMRS port and a time-frequency resource. Specifically, the mapping rules can be presented using pilot patterns. In a specific implementation process, mapping rules can be implemented using formulas or tables or in other ways. In a specific implementation process, the receiving end can learn from, using a DMRS port or using other information used to indicate a time-frequency resource corresponding to a DMRS, the time-frequency resource corresponding to the DMRS. Since the receiving end obtains the DMRS from the time-frequency resource, it is not limited in this order, and this can be implemented using a method in the prior art. In principle, if multiplexing is performed for m DMRS ports in a CDM manner, the receiving end can obtain m DMRS ports from only REs whose number is greater than or equal to the m where DMRS ports are transported, where m is an integer

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33/136 greater than or equal to 2. A specific DMRS value (which is usually a complex number, namely a modulation symbol) is usually selected from a sequence of values. A specific selected value is loaded, using a multiplexing code used to implement CDM, where a plurality of REs are allocated to the DMRS. For a specific loading method, refer to the prior art. These REs can correspond to different subcarriers in the same symbol, they can correspond to the same subcarriers in different symbols or they can correspond to different subcarriers in different symbols.

[0078] Fifth, below, that a number of subcarriers of a resource unit in the frequency domain is M is used as an example for description, where M is an integer greater than or equal to 1. For example, if a unit of resource is a pair of RBs (that is, two RBs in the time domain), M = 12; and if a resource unit has two RBs in the frequency domain, M = 24.

[0079] In addition, in the drawings attached to this specification, an RE corresponding to a symbol to which a DMRS port is mapped is shown, and an RE corresponding to another symbol is not shown. Information carried on another RE is not limited in this order.

[0080] The following are described the rules of mapping between one DMRS port and a time-resource -frequency provided [0081] in this order. Amount total of DMRS ports supported by the system is 6. [0082] 1. Resources for time-frequency for which the

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34/136 six DMRS ports are mapped include a first symbol of a resource unit in the time domain.

[0083] (1) The six DMRS ports include: a first DMRS port, a second DMRS port, a third DMRS port, a fourth DMRS port, a fifth DMRS port and a sixth DMRS port. It should be noted that they include means specifically have. This is similar in the examples below, and therefore the details are not described. The mapping rules for the six DMRS ports are as follows:

First:

A time-frequency resource to which the first DMRS port is mapped includes a 6n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second DMRS port is mapped includes a 6n + 1 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the third DMRS port is mapped includes a 6n + 2 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth DMRS port is mapped includes a 6n + 3 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fifth DMRS port is mapped includes a 6n + 4 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the sixth DMRS port is mapped includes a 6n + 5 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 6j.

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35/136 [0084] In this specification, ^L - ¹ means rounding down. In addition, in several mapping rules provided in this specification, if the time-frequency resources used to transport a plurality of DMRS ports (that is, transport DMRSs corresponding to the plurality of DMRS ports) do not occupy all of the resource unit's subcarriers in the frequency domain, the subcarriers used to transport the DMRS doors can be moved to a certain extent, based on a requirement. For example, after being moved, the 6n subcarrier used to transport the first DMRS port can be changed to a 6 + Δ subcarrier, where Δ is a predefined offset.

[0085] (a) in Figure 7 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a DMRS port is mapped, and n = 0 or 1.

Monday:

A time-frequency resource to which the first DMRS port is mapped includes at least one of a 12n subcarrier and a 12n + 1 subcarrier of the frequency domain resource unit.

A time-frequency resource to which the second DMRS port is mapped includes at least one of a 12n + 2 subcarrier and a 12n + 3 subcarrier of the frequency domain resource unit.

A time-frequency resource to which the third DMRS port is mapped includes at least one of a 12n + 4 subcarrier and a 12n + 5 subcarrier of the frequency domain resource unit.

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36/136

A time-frequency resource to which the fourth DMRS port is mapped includes at least one of a 12n + 6 subcarrier and a 12n + 7 subcarrier of the frequency domain resource unit.

A time-frequency resource to which the fifth DMRS port is mapped includes at least one from a 12n + 8 subcarrier and a 12n + 9 subcarrier from the frequency domain resource unit.

A time-frequency resource to which the sixth DMRS port is mapped includes at least one from a 12n + 10 subcarrier and a 12n + 11 subcarrier from the frequency domain resource unit.

n can be any one or more integers greater than or equal to 0 and less than or equal to \ _M / 12j.

[0086] (b) in Figure 7 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[0087] (2) The six DMRS ports are divided into three groups of DMRS ports, and each group of DMRS ports includes two DMRS ports. The three DMRS port groups include a first DMRS port group, a second DMRS port group and a third DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The mapping rules for the three DMRS port groups are as follows:

First:

A time-frequency resource to which the first group of DMRS ports is mapped includes a 3n subcarrier from

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37/136 resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes a 3n + subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the third group of DMRS ports is mapped includes a 3n + subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J.

[0088] (a) in Figure 8 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3. For example, any three ports on the DMRS ports can be used as a group of DMRS ports and the other three ports can be used as a DMRS port group. For example, DMRS ports 1 to 3 are used as a first group of DMRS ports and DMRS ports 4 to 6 are used as a second group of DMRS ports. This is certainly not limited during specific implementation. In this solution, the doors are evenly distributed in the frequency domain and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a characteristic of a low peak-to-average power ratio (PAPR), and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario. , thus facilitating joint project of uplink and downlink or

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38/136 multi-wave transmission; and this solution is applicable to a multi-user MIMO scenario (multi-user MIMO, MU-MIMO) (MU-MIMO scenario), thus reducing DMRS indication overheads and system design complexity. In this solution, only one symbol is occupied. Therefore, system overloads are low and this solution can be used in a high frequency scenario. This solution can also support more doors, in order to add symbols and, therefore, flexibility is better. In addition, the ports are mapped uniformly in the frequency domain, thus facilitating flexible scheduling. In addition, powerboosting or data transmission can be performed at an unoccupied door group location.

Monday:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 6 subcarrier, and a 12n + 7 subcarrier from the resource unit in the domain frequency.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 8 subcarrier and a 12n + 9 subcarrier from the resource unit in the frequency domain.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier from the resource unit in the frequency domain.

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39/136 n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0089] (b) in Figure 8 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[0090] (3) The six DMRS ports are divided into two groups of DMRS ports, and each group of DMRS ports includes three DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First:

A time-frequency resource to which the first DMRS port group is mapped includes a 2n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second DMRS port group is mapped includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 2j.

[0091] (a) in Figure 9 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4 or 5. In this solution, the ports are uniformly distributed in the frequency domain and have a high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are

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40/136 evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In this solution, only one symbol is occupied. Therefore, system overloads are low and this solution can be used in a high frequency scenario. This solution can also support more doors, in order to add symbols and, therefore, flexibility is better. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location.

Monday:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

A time-to-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a

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41/136 subcarrier 12η + 10 and a subcarrier 12η + 11 of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0092] (b) in Figure 9 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[0093] (4) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the six DMRS ports. In this case, the six DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

First:

A time-frequency resource to which the DMRS port group is mapped includes a 2n subcarrier of the resource unit in the frequency domain; or a time-frequency resource to which the DMRS port group is mapped includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 2j.

[0094] (a) in Figure 10 is a schematic diagram of a mapping rule for the six DMRS ports. In the figure, where a time-frequency resource to which the DMRS port group is mapped includes the resource unit's 2n subcarrier in the frequency domain is used as an example for description. Each small shaded block indicates a RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5. A small blank block indicates a RE for which

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42/136 a DMRS port is not mapped.

Monday:

A time-frequency resource to which the DMRS port group is mapped includes a subcarrier n of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than M.

[0095] (b) in Figure 10 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[0096] 2. The time-frequency resources to which the six DMRS ports are mapped include a first symbol and a second symbol of a resource unit in the time domain.

[0097] (1) The six DMRS ports include: a first DMRS port, a second DMRS port, a third DMRS port, a fourth DMRS port, a fifth DMRS port and a sixth DMRS port. The mapping rules for the six DMRS ports are as follows:

First: Time-frequency resources to which the six DMRS ports are mapped include sub-carriers of the resource unit in the frequency domain, where the sub-carriers are the same as those in the first solution corresponding to (a) in Figure 7. In this case, an example is shown in (a) in Figure 11.

Second: Time-frequency resources to which the six DMRS ports are mapped include resource unit subcarriers in the frequency domain, where the subcarriers are the same as those in the second solution

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43/136 corresponding to (b) in Figure 7. In this case, an example is shown in (b) in Figure 11.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[0098] When a time-frequency resource to which the first DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain.

[0099] When a time-frequency resource to which the second DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain.

[00100] When a time-frequency resource to which the third DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a

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44/136 subcarrier 6n + 5 of the resource unit in the frequency domain.

[00101] When a time-frequency resource to which the fourth DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the fourth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain.

[00102] When a time-frequency resource to which the fifth DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the fifth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain.

[00103] When a time-frequency resource to which the sixth DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 5 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the sixth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain.

[00104] n can be any one or more whole numbers

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45/136 greater than or equal to 0 and less than \ _M / 6J.

[00105] (c) in Figure 11 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a DMRS port is mapped, and n = 0 or 1.

Fourth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00106] When a time-frequency resource to which the first DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier and a 12n + 1 subcarrier from the unit appeal in the frequency domain; and when a time-frequency resource to which the first DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier and a 12n + 7 subcarrier from the unit resource in the frequency domain.

[00107] When a time-frequency resource to which the second DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 2 subcarrier and a 12n + 3 subcarrier the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 8 subcarrier and a 12n + 9 subcarrier from the unit resource in the frequency domain.

[00108] When a time-frequency resource to which the third DMRS port is mapped is the first symbol in the

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46/136 time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier and a 12n + 5 subcarrier of the frequency domain resource unit; and when a time-frequency resource to which the third DMRS port is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 10 subcarrier and a 12n + 11 subcarrier from the unit resource in the frequency domain.

[00109] When a time-frequency resource to which the fourth DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier and a 12n + 7 subcarrier the resource unit in the frequency domain; and when a time-frequency resource to which the fourth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier and a 12n + 1 subcarrier from the resource unit in the frequency domain.

[00110] When a time-frequency resource to which the fifth DMRS port is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 8 subcarrier and a 12n + 9 subcarrier the resource unit in the frequency domain; and when a time-frequency resource to which the fifth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 2 subcarrier and a 12n + 3 subcarrier from the unit resource in the frequency domain.

[00111] When a time-frequency resource to which the sixth DMRS port is mapped is the first symbol in the domain

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47/136 of the time, the time-frequency resource includes at least one of a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the sixth DMRS port is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier and a 12n + 5 subcarrier of the unit resource in the frequency domain.

[00112] n can be any one or more integers greater than or equal to 0 and less than or equal to \ _M / 12j.

[00113] (d) in Figure 11 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00114] (2) The six DMRS ports are divided into three groups of DMRS ports, and each group of DMRS ports includes two DMRS ports. The three DMRS port groups include a first DMRS port group, a second DMRS port group, and a third DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The mapping rules for the three DMRS port groups are as follows:

First: A time-frequency resource to which each group of DMRS ports is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the first solution corresponding to (a) in Figure 8. In this case, an example is shown in (a ) in Figure 12. In this solution, the

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48/136 ports are uniformly distributed in the frequency domain and distributed in both symbols, and have high density. This ensures high accuracy of channel estimation in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, in this solution, a method for multiplexing more ports in each port group supports transmission over more ports without changing an original port mapping. Therefore, this solution is more commonly used. In addition, the ports are mapped uniformly in the frequency domain, thus facilitating flexible scheduling. In addition, power boosting or data transmission can be performed at an unoccupied door group location. The CDM length is small, thus ensuring better orthogonality between the doors.

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the second solution corresponding to (b) in Figure 8. In this case, an example is

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49/136 shown in (b) in Figure 12.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00115] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain.

[00116] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain.

[00117] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain ; and when a temperature-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the unit

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50/136 of appeal in the frequency domain.

[00118] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J.

[00119] (c) in Figure 12 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3.

Fourth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00120] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain.

[00121] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain.

[00122] When a time-frequency resource to which the third DMRS port group is mapped is the first

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51/136 symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain.

[00123] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J.

[00124] (d) in Figure 12 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3.

Fifth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00125] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier , a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00126] When a time-frequency resource for which

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52/136 the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency feature includes at least one of a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 8 subcarrier and one sub-carrier 12n + 9 of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 6 subcarrier, and a 12n + 7 subcarrier of the resource unit in the frequency domain.

[00127] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier, a 12n subcarrier + 5, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier , a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain.

[00128] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0012 9] (e) in Figure 12 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

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Sixth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00130] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier , a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain.

[00131] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one of a 12n + 4 subcarrier, a 12n + 5 subcarrier , a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00132] When a time-frequency resource to which the third DMRS port group is mapped is the first

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54/136 symbol in the time domain, the time-frequency resource includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier from the resource unit in the frequency; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 6 subcarrier, and a 12n + 7 subcarrier of the resource unit in the frequency domain.

[00133] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00134] (f) in Figure 12 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00135] (3) The six DMRS ports are divided into two groups of DMRS ports, and each group of DMRS ports includes three DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each DMRS port group is mapped in the frequency domain, reference can be made to the first

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55/136 solution corresponding to (a) in Figure 9. In this case, an example is shown in (a) in Figure 13. In this solution, the doors are evenly distributed in the frequency domain and distributed in the two symbols, and have a high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, in this solution, a method for multiplexing more ports in each port group supports transmission over more ports without changing an original port mapping. Therefore, this solution is more commonly used. In addition, the ports are mapped uniformly in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location. In addition, the length of CDM in a group of doors is small, thus ensuring better orthogonality between the doors.

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each group of DMRS ports is mapped in the domain of

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56/136 frequency, reference can be made to the second solution corresponding to (b) in Figure 9. In this case, an example is shown in (b) in Figure 13.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00136] When a time-frequency resource to which the first group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

[00137] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

[00138] n can be any one or more integers greater than or equal to 0 and less than \ _M / 2J.

[00139] (c) in Figure 13 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5.

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57/136

Fourth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00140] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 2, an subcarrier 12n + 6, an 12n subcarrier + 7 and an subcarrier 12n + 8 gives resource unit in domain gives frequency; and When one time-frequency feature for the

which the first group of DMRS ports is mapped to is the second symbol in the time domain, the time-frequency feature includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n subcarrier + 9, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00141] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource for which the second group of

doors DMRS is mapped is the second symbol at the domain of time, the time feature -frequency includes fur any less an of a 12n subcarrier, a sub carrier 12n + 1, an 12n + 2 subcarrier, a sub carrier 12n + 6, an

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58/136 subcarrier 12η + 7 and a subcarrier 12η + 8 of the resource unit in the frequency domain.

[00142] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00143] (d) in Figure 13 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fifth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00144] When a time-frequency resource to which the first group of DMRS ports is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, one 12n + 1 subcarrier, 12n + 4 subcarrier, 12n + 5 subcarrier, 12n + 8 subcarrier and 12n + 9 subcarrier of the resource unit in the frequency domain.

[00145] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol and the second symbol in the time domain, the temperature-frequency resource includes at least one of a 12n + 2 subcarrier, one 12n + 3 subcarrier, 12n + 6 subcarrier, 12n + 7 subcarrier, 12n + 10 subcarrier and 12n + 11 subcarrier of the resource unit in the frequency domain.

[00146] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00147] (e) in Figure 13 is a schematic diagram of a

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59/136 mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Sixth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00148] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 4, an subcarrier 12n + 5, an 12n subcarrier + 8 and an subcarrier 12n + 9 gives resource unit in domain gives frequency; and When one time-frequency feature for the

which the first group of DMRS ports is mapped to is the second symbol in the time domain, the time-frequency feature includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 6 subcarrier, a 12n subcarrier + 7, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00149] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the domain of

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60/136 time, the time-frequency feature includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, a 12n + 8 subcarrier and a 12n + 9 subcarrier resource unit in the frequency domain.

[00150] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00151] (f) in Figure 13 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00152] (4) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the six DMRS ports. In this case, the six DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

First: A time-frequency resource to which the DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which the DMRS port group is mapped in the frequency domain, reference can be made to the first solution corresponding to (a) in Figure 10. In this case, an example is shown in (a ) in Figure 14.

Second: A time-frequency resource to which the DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which the DMRS port group is mapped in the frequency domain, reference can be made to the second solution corresponding to (b) in Figure 10. In this case, an example is shown in (b ) in Figure 14.

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61/136

Third:

When a time-frequency resource to which the DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 2j.

[00153] (c) in Figure 14 is a schematic diagram of a mapping rule for the six DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4 or 5. A small blank block indicates an RE to which a DMRS port is not mapped.

[00154] A total number of DMRS ports supported by the system is 8.

[00155] 1. Time-frequency resources to which the eight DMRS ports are mapped include a first symbol of a resource unit in the time domain.

[00156] The eight DMRS ports are divided into four groups of DMRS ports, and each DMRS port group includes two DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules of

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62/136 mapping of the four DMRS port groups are as follows:

A time-frequency resource to which the first DMRS port group is mapped includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, and a 12n + 2 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, and a 12n + 5 subcarrier from the frequency domain resource unit.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one of a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth DMRS port group is mapped includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier, and a 12n + 11 subcarrier from the frequency domain resource unit.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00157] Figure 15 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00158] 2. The time-frequency resources to which the eight DMRS ports are mapped include a first symbol and a second symbol of a resource unit in the domain of

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63/136 time.

[00159] (1) The eight DMRS ports are divided into four groups of DMRS ports, and each group of DMRS ports includes two DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the four DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to Figure 15. In this case, an example is shown in (a) in Figure 16

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00160] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier and a 12n +2 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier, a 12n + 7 subcarrier and a 12n +8 subcarrier

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64/136 of the resource unit in the frequency domain.

[00161] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4 and a 12n + 5 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier and one 12n +11 subcarrier of the resource unit in the frequency domain.

[00162] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 6 subcarrier, a 12n subcarrier + 7 and a 12n + 8 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier and one 12n + 2 subcarrier of the resource unit in the frequency domain.

[00163] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 9 subcarrier, a 12n subcarrier + 10 and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a temp frequency resource for which the fourth DMRS port group is

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65/136 mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier and a 12n +5 subcarrier from the resource unit in the frequency domain.

[00164] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00165] (b) in Figure 16 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Third: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00166] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 4 subcarrier and a 12n +8 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 2 subcarrier, a 12n + 6 subcarrier and a 12n + 10 subcarrier of the resource unit in the frequency domain.

[00167] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 1 subcarrier, a 12n subcarrier + 5 and a 12n + 9 subcarrier of the resource unit in the frequency domain; and when a time feature

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66/136 frequency to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency feature includes at least one of a 12n + 3 subcarrier, a 12n + 7 subcarrier and a 12n subcarrier +11 resource unit in the frequency domain.

[00168] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 6 and a 12n + 10 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 4 subcarrier and a 12n + 8 subcarrier of the resource unit in the frequency domain.

[00169] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 7 and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a temperature-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 1 subcarrier, a 12n + 5 subcarrier and one 12n + 9 subcarrier of the resource unit in the frequency domain.

[00170] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00171] (c) in Figure 16 is a schematic diagram of a

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67/136 rule for mapping the eight DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fourth: time-frequency resources to which the first and second groups of DMRS ports are mapped include the first symbol in the time domain, and time-frequency resources to which the third and fourth groups of DMRS ports are mapped include the second symbol in the time domain.

[00172] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

[00173] When the time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain .

[00174] When the time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

[00175] When the time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain .

[00176] n can be any one or more whole numbers

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68/136 greater than or equal to 0 and less than \ _M / 2J.

[00177] (d) in Figure 16 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4 or 5. In this solution, the ports are uniformly distributed in the frequency domain and have a high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In this solution, each port is mapped to only one symbol. Therefore, impact of phase noise is avoided, and this solution can be used in a high frequency scenario. In this solution, different amounts of symbols can also be used for different ports, and a port mapping location is fixed. Therefore, flexibility is better, performance is guaranteed, and overhead is reduced. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling.

[00178] (2) The eight DMRS ports are divided into two groups of DMRS ports, and each DMRS port group includes four DMRS ports. The two groups of DMRS ports include a

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69/136 first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00179] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, one 12n + 1 subcarrier, 12n + 4 subcarrier, 12n + 5 subcarrier, 12n + 8 subcarrier and 12n + 9 resource subcarrier in the frequency domain.

[00180] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol and the second symbol in the time domain, the temperature-frequency resource includes at least one from a 12n + 2 subcarrier, one 12n + 3 subcarrier, 12n + 6 subcarrier, 12n + 7 subcarrier, 12n + 10 subcarrier and 12n + 11 subcarrier of the resource domain in the frequency domain.

[00181] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00182] (a) in Figure 17 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0. In this solution, the ports are distributed

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70/136 uniformly in two symbols in the time domain and in the frequency domain and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, this solution is applicable to a plurality of types of carrier systems, and uplink and downlink systems, thus reducing DMRS indication overheads and design complexity. In this solution, each port is mapped to only consecutive REs, so that orthogonality between ports in a group of ports is less affected by a channel. This ensures the accuracy of the channel estimate. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location.

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00183] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 4, an subcarrier 12n + 5, an 12n subcarrier + 8 and an subcarrier 12n + 9 gives resource unit in domain gives frequency; and When one time-frequency feature for the

which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency feature includes at least one of a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 6 subcarrier, a

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71/136 subcarrier 12η + 7, one subcarrier 12n + 10 and one subcarrier 12n + 11 of the resource unit in the frequency domain.

[00184] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, 12n + 5 subcarrier, 12n + 8 subcarrier and 12n + 9 subcarrier of the resource unit in the frequency domain.

[00185] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0018 6] (b) in Figure 17 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00187] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the domain

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72/136 of the frequency; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

[00188] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

[00189] n can be any one or more integers greater than or equal to 0 and less than \ _M / 2j.

[00190] (c) in Figure 17 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5.

Fourth: A time-frequency resource to which the first group of DMRS gates is mapped includes the first symbol in the time domain, and a time-frequency resource to which the second group of DMRS gates is mapped includes the second symbol in the time domain.

[00191] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a subcarrier n of the resource unit in the frequency domain.

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73/136 [00192] When the time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a sub-carrier n of the resource unit in the frequency.

[00193] n can be any one or more integers greater than or equal to 0 and less than M.

[00194] (d) in Figure 17 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00195] (3) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the eight DMRS ports. In this case, the eight DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

When a time-frequency resource to which the DMRS port group is mapped includes the first symbol and the second symbol in the time domain, the time-frequency resource includes a subcarrier n of the resource unit in the frequency domain.

[00196] n can be any one or more integers greater than or equal to 0 and less than M.

[00197] Figure 18 is a schematic diagram of a mapping rule for the eight DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00198] A total number of DMRS ports supported by the system is 12.

[00199] 1. The time-frequency resources for which

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74/136 the 12 DMRS ports that are mapped include a first symbol of a resource unit in the time domain.

[00200] (1) The 12 DMRS ports are divided into six groups of DMRS ports, and each DMRS port group includes two DMRS ports. The six DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, a fourth DMRS port group, a fifth DMRS port group and a sixth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The mapping rules for the six DMRS port groups are as follows: First:

A time-frequency resource to which the first DMRS port group is mapped includes at least one of a 12n subcarrier and a 12n + 1 subcarrier of the frequency domain resource unit.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 2 subcarrier and a 12n + 3 subcarrier from the frequency domain resource unit.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one of a 12n + 4 subcarrier and a 12n + 5 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth group of DMRS ports is mapped includes at least one of a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain.

A time-frequency resource for which the fifth group

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75/136 of DMRS ports mapped include at least one from a 12n + 8 subcarrier and a 12n + 9 subcarrier from the frequency domain resource unit.

A time-frequency resource to which the sixth DMRS port group is mapped includes at least one of a 12n + 10 subcarrier and a 12n + 11 subcarrier of the frequency domain resource unit.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00201] (a) in Figure 19 is a schematic diagram of a mapping rule for the twelve DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Monday:

A time-frequency resource to which the first group of DMRS ports is mapped includes a 6n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes a 6n + subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the third group of DMRS ports is mapped includes a 6n + subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth DMRS port group is mapped includes a 6n + 3 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fifth group of DMRS ports is mapped includes a 6n + 4 subcarrier of the resource unit in the frequency domain.

A time-frequency resource for which the sixth group

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76/136 of DMRS ports is mapped includes a 6n + 5 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 6j.

[00202] (b) in Figure 19 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0 or 1. The ports are uniformly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In this solution, only one symbol is occupied. Therefore, system overloads are low and this solution can be used in a high frequency scenario. This solution can also support more doors, in order to add symbols and, therefore, flexibility is better. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location. In addition, in this solution, a port mapping location is fixed, the same pilot pattern is used for different ports and, therefore, system indication overheads are reduced.

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77/136 [00203] (2) The 12 DMRS ports are divided into four groups of DMRS ports, and each group of DMRS ports includes three DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the four DMRS port groups are as follows:

A time-frequency resource to which the first DMRS port group is mapped includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, and a 12n + 2 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, and a 12n + 5 subcarrier from the frequency domain resource unit.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one of a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth DMRS port group is mapped includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier, and a 12n + 11 subcarrier from the frequency domain resource unit.

n can be any one or more larger integers

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78/136 or equal to 0 and less than \ _M / 12j.

[00204] (a) in Figure 20 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00205] (3) The 12 DMRS ports are divided into three groups of DMRS ports, and each DMRS port group includes four DMRS ports. The three DMRS port groups include a first DMRS port group, a second DMRS port group, and a third DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The mapping rules for the three DMRS port groups are as follows:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n +2 subcarrier, and a 12n + 3 subcarrier from the resource unit in the domain frequency.

A time-to-frequency resource to which the second DMRS port group is mapped includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 6 subcarrier, and a 12n + 7 subcarrier from the resource in the frequency domain.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one from a 12n + 8 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier from the resource unit in the frequency domain.

n can be any one or more larger integers

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79/136 or equal to 0 and less than \ _M / 12j.

[0020 6] (b) in Figure 20 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00207] (4) The 12 DMRS ports are divided into two groups of DMRS ports, and each DMRS port group includes six DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 4 subcarrier, and a 12n + 5 subcarrier of the resource unit in the frequency domain.

A time-to-frequency resource to which the second DMRS port group is mapped includes at least one from a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 8 subcarrier, a 12n + 9 subcarrier, a 12n subcarrier + 10 and a 12n + 11 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00208] (a) in Figure 21 is a schematic diagram of a rule for mapping the 12 DMRS ports. Each small block

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80/136 shaded indicates an RE to which a DMRS port group is mapped, and n = 0.

Monday:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n subcarrier + 10 and a 12n + 11 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0020 9] (b) in Figure 21 is a schematic diagram of a rule for mapping the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Third:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 8 subcarrier, and a 12n + 9 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one of

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81/136 sub-carrier 12η + 2, a sub-carrier 12n + 3, a sub-carrier 12n + 6, a sub-carrier 12n + 7, a sub-carrier 12n + 10 and a sub-carrier 12n + 11 of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00210] (c) in Figure 21 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fourth:

A time-frequency resource to which the first DMRS port group is mapped includes a 2n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than \ _M / 2J.

[00211] (d) in Figure 21 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4 or 5. In this solution, the ports are uniformly distributed in the frequency domain and have a high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a

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82/136 single carrier transmission, thus facilitating joint project of uplink and downlink transmission or multi-wave transmission; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In this solution, only one symbol is occupied. Therefore, system overloads are low and this solution can be used in a high frequency scenario. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location. A port mapping location is fixed, the same pilot pattern is used for different ports and therefore system indication overheads are reduced.

[00212] (4) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the 12 DMRS ports. In this case, the 12 DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

A time-frequency resource to which the DMRS port group is mapped includes a subcarrier n of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than M.

[00213] Figure 22 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00214] 2. The time-frequency resources for which

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83/136 the 12 DMRS ports that are mapped include a first symbol and a second symbol of a resource unit in the time domain.

[00215] (1) The 12 DMRS ports are divided into six groups of DMRS ports, and each DMRS port group includes two DMRS ports. The six DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, a fourth DMRS port group, a fifth DMRS port group and a sixth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the six DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (a) in Figure 19. In this case, an example is shown in (a) in Figure 23

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00216] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier and a 12n + 1 subcarrier the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second

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84/136 symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier and a 12n + 7 subcarrier from the resource unit in the frequency domain.

[00217] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier and a 12n subcarrier + 3 of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 8 subcarrier and a 12n + 9 subcarrier resource unit in the frequency domain.

[00218] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier and a 12n subcarrier + 5 of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 10 subcarrier and a 12n + 11 subcarrier resource unit in the frequency domain.

[00219] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier and a 12n subcarrier + 7 of the resource unit in the frequency domain; and

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85/136 when a time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier and a 12n + 1 subcarrier resource unit in the frequency domain.

[00220] When a time-frequency resource to which the fifth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 8 subcarrier and a 12n subcarrier + 9 of the resource unit in the frequency domain; and when a time-frequency resource to which the fifth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 2 subcarrier and a 12n + 3 subcarrier resource unit in the frequency domain.

[00221] When a time-frequency resource to which the sixth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 10 subcarrier and a 12n subcarrier + 11 of the resource unit in the frequency domain; and when a time-frequency resource to which the sixth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 4 subcarrier and a 12n + 5 subcarrier resource unit in the frequency domain.

[00222] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00223] (b) in Figure 23 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small block

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Shaded 86/136 indicates an RE to which a DMRS port group is mapped, and n = 0.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00224] When a time-frequency resource to which the first group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain.

[00225] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain.

[00226] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the third group of DMRS ports is mapped is the second time domain symbol, the resource

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87/136 time-frequency includes a 6n + 5 subcarrier of the resource unit in the frequency domain.

[00227] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 3 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n subcarrier of the resource unit in the frequency domain.

[00228] When a time-frequency resource to which the fifth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 4 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the fifth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 1 subcarrier of the resource unit in the frequency domain.

[00229] When a time-frequency resource to which the sixth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 6n + 5 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the sixth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 6n + 2 subcarrier of the resource unit in the frequency domain.

[00230] n can be any one or more whole numbers

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88/136 greater than or equal to 0 and less than \ _M / 6J.

[00231] (c) in Figure 23 is a schematic diagram of a rule for mapping the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0 or 1.

Fourth: Time-frequency resources to which the first, second, and third groups of DMRS ports are mapped include the first symbol in the time domain, and time-frequency resources for which the fourth, fifth, and sixth groups of DMRS are mapped. DMRS ports that are mapped include the second symbol in the time domain.

[00232] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain.

[00233] When the time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain .

[00234] When the time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain .

[00235] When the time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the domain of

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89/136 frequency.

[00236] When the time-frequency resource to which the fifth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain .

[00237] When the time-frequency resource to which the sixth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain .

[00238] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J.

[00239] (d) in Figure 23 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2 or 3. In this solution, the ports are evenly distributed in the frequency domain and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In this solution, each port is mapped to

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90/136 just a symbol. Therefore, impact of phase noise is avoided, and this solution can be used in a high frequency scenario. In this solution, a number of symbols can be configured dynamically when the number of ports is different. Therefore, flexibility is better, performance is guaranteed, and overhead is reduced. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling.

[00240] (2) The 12 DMRS ports are divided into four groups of DMRS ports, and each DMRS port group includes three DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the four DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (a) in Figure 20. In this case, an example is shown in (a) in Figure 24

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00241] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

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91/136 includes at least one of a 12n subcarrier, a 12n + 1 subcarrier and a 12n +2 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier, a 12n + 7 subcarrier and a 12n +8 subcarrier of the resource unit in the frequency domain.

[00242] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4 and a 12n + 5 subcarrier of the resource unit in the frequency domain; and when a temperature-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier and one 12n +11 subcarrier of the resource unit in the frequency domain.

[00243] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 6 subcarrier, a 12n subcarrier + 7 and a 12n + 8 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier and one resource carrier 12n + 2 in the frequency domain.

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92/136 [00244] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a temperature-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier and one 12n +5 subcarrier of the resource unit in the frequency domain.

[00245] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0024 6] (b) in Figure 24 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Third: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00247] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 4n subcarrier of the resource unit in the domain frequency.

[00248] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 4n + 1 subcarrier of the resource unit in the domain frequency.

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93/136 [00249] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 4n + 2 subcarrier from resource unit in the frequency domain.

[00250] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 4n + 3 subcarrier of the resource unit in the domain frequency.

[00251] n can be any one or more integers greater than or equal to 0 and less than \ _M / 4j.

[00252] (c) in Figure 24 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS gates is mapped, and n = 0, 1 or 2. In this solution, the gates are uniformly distributed in the frequency domain and distributed in both symbols, and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, a port mapping location is fixed,

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94/136 and flexible port transmission is supported without changing an original port mapping. Therefore, this solution is more commonly used, and system indication overheads are reduced. In addition, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at an unoccupied door group location. In addition, the length of CDM in each group of doors is small, thus ensuring better orthogonality between the doors.

Fourth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00253] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n + 2 subcarrier of the resource unit in the frequency domain.

[00254] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes a 4n + 3 subcarrier of the resource unit in the

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95/136 frequency domain.

[00255] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 2 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n subcarrier of the resource unit in the frequency domain.

[00256] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 3 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n + 1 subcarrier of the resource unit in the frequency domain.

[00257] n can be any one or more integers greater than or equal to 0 and less than \ _M / 4J.

[00258] (d) in Figure 24 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1 or 2.

Fifth: Time-frequency features to which the first and second DMRS port groups are mapped include the first symbol in the time domain, and time-frequency features to which the third and fourth DMRS port groups are mapped include the second symbol in the field of

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96/136 time.

[00259] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an of a subcarrier 12n, one subcarrier 12n + 1, a 12n subcarrier + 2, one subcarrier 12n + 6, a 12n + subcarrier 7, and a subcarrier 12n + 8 da resource unit in domain of frequency. [00260] When the time-frequency feature for which

the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency feature includes at least one from a 12n + 3 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + subcarrier 9, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00261] When the time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 2 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier and a 12n + 8 subcarrier of the resource domain in the frequency domain.

[00262] When the time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource domain in the frequency domain.

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97/136 [00263] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[002 64] (e) in Figure 24 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

[00265] (3) The 12 DMRS ports are divided into three groups of DMRS ports, and each DMRS port group includes four DMRS ports. The three DMRS port groups include a first DMRS port group, a second DMRS port group, and a third DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The mapping rules for the three DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00266] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, one 12n + 1 subcarrier, 12n + 2 subcarrier and 12n + 3 subcarrier of the resource unit in the frequency domain.

[00267] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol and the second symbol in the time domain, the temperature-frequency resource includes at least one from a 12n + 4 subcarrier, one 12n + 5 subcarrier, 12n + 6 subcarrier and one

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98/136 subcarrier 12η + 7 of the resource unit in the frequency domain.

[00268] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes at least one of a 12n + 8 subcarrier , a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00269] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00270] (a) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00271] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 12n subcarrier, a 12n + 1 subcarrier, a 12n subcarrier + 2 and a 12n + 3 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 8 subcarrier, a 12n + 9 subcarrier , a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

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99/136 [00272] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 12n + 4 subcarrier, a 12n + subcarrier 5, a 12n + 6 subcarrier, and a 12n + 7 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, and a 12n + 3 subcarrier of the resource unit in the frequency domain.

[00273] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 8 subcarrier, a 12n subcarrier + 9, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier , a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain.

[00274] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00275] (b) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE for which a group of DMRS ports

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100/136 is mapped, and n = 0.

Third: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00276] When a time-frequency resource to which the first group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 2 subcarrier and a 12n + 3 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 4 subcarrier, a 12n + 5 subcarrier , a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain.

[00277] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier, a 12n subcarrier + 5, a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 8 subcarrier, a 12n + 9 subcarrier , a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00278] When a time-frequency resource for which

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101/136 the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency feature includes at least one of a 12n + 8 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and one sub-carrier 12n + 11 of the resource unit in the frequency domain; and when a time-frequency resource to which the third group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, and a 12n + 3 subcarrier of the resource unit in the frequency domain.

[00279] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00280] (c) in Figure 25 is a schematic diagram of a 12-port DMRS mapping rule. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fourth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00281] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the domain frequency.

[00282] When the time-frequency resource to which the second group of DMRS ports is mapped is the first symbol and the second symbol in the time domain, the temperature-frequency resource includes a 3n + 1 subcarrier of the

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102/136 resource in the frequency domain.

[00283] When the time-frequency resource to which the third DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain.

[00284] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3J.

[00285] (d) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3. In this solution, the ports are uniformly distributed in the frequency domain and distributed in both symbols, and have a high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi-transmission transmission. wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, in this solution, a port mapping location is fixed. Therefore, this solution is more commonly used, and system indication overheads are reduced. Furthermore, in this solution, the ports are uniformly mapped in the frequency domain, thus facilitating scheduling

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103/136 flexible. In addition, power boosting or data transmission can be performed at an unoccupied door group location.

Fifth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00286] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain.

[00287] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain.

[00288] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain ; and when a temp frequency resource for which the third DMRS port group is

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104/136 mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain.

[00289] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3j.

[002 90] (e) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3.

Sixth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00291] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain.

[00292] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain.

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105/136 [00293] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 3n + 2 subcarrier of the resource unit in the frequency domain; and when a temperature-frequency resource to which the third group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 3n subcarrier of the resource unit in the frequency domain.

[00294] n can be any one or more integers greater than or equal to 0 and less than \ _M / 3j.

[00295] (f) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, en = 0, 1, 2 or 3.

Seventh: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00296] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 6 subcarrier and a 12n + 7 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one of a 12n + 4 subcarrier, a 12n + 5 subcarrier , a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the field of

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106/136 frequency.

[00297] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 6 subcarrier, and a 12n + 7 subcarrier of the resource unit in the frequency domain.

[00298] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 4 subcarrier, a 12n subcarrier + 5, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier , a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain.

[00299] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00300] (g) in Figure 25 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small block

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Shaded 107/136 indicates an RE to which a DMRS port group is mapped, and n = 0.

[00301] (4) The 12 DMRS ports are divided into two groups of DMRS ports, and each DMRS port group includes six DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (a) in Figure 21. In this case, an example is shown in (a) in Figure 26.

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (b) in Figure 21. In this case, an example is shown in (b) in Figure 26.

Third: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (c) in Figure 21. In this case, an example is

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108/136 shown in (c) in Figure 26.

Fourth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (d) in Figure 21. In this case, an example is shown in (d) in Figure 26.

Fifth: A time-frequency resource to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00302] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at one less in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 2, an subcarrier 12n + 3, an 12n subcarrier + 4 e an subcarrier 12n + 5 da resource unit in domain gives

frequency; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 6 subcarrier, a 12n + 7 subcarrier , a 12n + 8 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the frequency domain resource unit.

[00303] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 6 subcarrier, a subcarrier

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109/136

12η + 7, a 12η + 8 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, 12n + 3 subcarrier, 12n + 4 subcarrier and 12n + 5 subcarrier of the resource unit in the frequency domain.

[00304] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00305] (a) in Figure 27 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Sixth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00306] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 2, an subcarrier 12n + 6, an 12n subcarrier + 7 and an subcarrier 12n + 8 gives resource unit in domain gives frequency; and When one time-frequency feature for the

which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency feature includes at least one of a 12n + 3 subcarrier, one

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110/136 subcarrier 12η + 4, one subcarrier 12n + 5, one subcarrier 12n + 9, one subcarrier 12n + 10 and one subcarrier 12n + 11 of the resource unit in the frequency domain.

[00307] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 2 subcarrier, 12n + 6 subcarrier, 12n + 7 subcarrier and 12n + 8 subcarrier of the resource domain in the frequency domain.

[00308] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[0030 9] (b) in Figure 27 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Seventh: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00310] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

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111/136

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 4, an subcarrier 12n + 5, an 12n subcarrier + 8 and an subcarrier 12n + 9 da resource unit in domain gives

frequency; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second time domain symbol, the time-frequency resource includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier , a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00311] When a time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, 12n + 5 subcarrier, 12n + 8 subcarrier and 12n + 9 subcarrier of the resource unit in the frequency domain.

[00312] n can be any one or more integers greater than or equal to 0 and less than \ _M / 12j.

[00313] (c) in Figure 27 is a schematic diagram of a rule for mapping the 12 DMRS ports. Each small block

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Shaded 112/136 indicates an RE to which a DMRS port group is mapped, and n = 0.

Eighth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00314] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

[00315] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

[00316] n can be any one or more integers greater than or equal to 0 and less than \ _M / 2J.

[00317] (d) in Figure 27 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5.

Ninth: A time-frequency resource for which the

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113/136 first DMRS port group is mapped includes the first symbol in the time domain, and a time-frequency feature to which the second DMRS port group is mapped includes the second symbol in the time domain.

[00318] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource is a 2n subcarrier of the resource unit in the frequency domain.

[00319] When the time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource is a 2n subcarrier of the resource unit in the frequency domain.

[00320] n can be any one or more integers greater than or equal to 0 and less than \ _M / 2j.

[00321] (e) in Figure 27 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5. Each small blank block indicates an RE for which a group of DMRS ports is not mapped.

[00322] (4) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the 12 DMRS ports. In this case, the 12 DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

When the time-frequency resource to which the DMRS port group is mapped is the first symbol and the second symbol in the time domain, the time-frequency resource

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114/136 includes a subcarrier n of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than M.

[00323] Figure 28 is a schematic diagram of a mapping rule for the 12 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00324] A total number of DMRS ports supported by the system is 16.

[00325] 1. time-frequency resources to which the 16 DMRS ports are mapped include a first symbol of a resource unit in the time domain.

[00326] (1) The 16 DMRS ports are divided into four groups of DMRS ports, and each group of DMRS ports includes four DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the four DMRS port groups are as follows:

First:

A time-frequency resource to which the first DMRS port group is mapped includes at least one of a 12n subcarrier, a 12n + 1 subcarrier, and a 12n + 2 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes at least one of

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115/136 subcarrier 12η + 3, a subcarrier 12n + 4, and a subcarrier 12n + 5 of the resource unit in the frequency domain.

A time-frequency resource to which the third group of DMRS ports is mapped includes at least one of a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the fourth DMRS port group is mapped includes at least one of a 12n + 9 subcarrier, a 12n + 10 subcarrier, and a 12n + 11 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than nk / 12j or equal to 0 and less than ^LJ .

[00327] (a) in Figure 29 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Monday:

A time-frequency resource to which the first DMRS port group is mapped includes a 4n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes a 4n + subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the third DMRS port group is mapped includes a 4n + subcarrier of the resource unit in the frequency domain.

A time-frequency resource for which the fourth group

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116/136 of DMRS ports mapped includes a 4n + 3 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than „lw / 4j or equal to 0 and less than ^LJ .

[00328] (b) in Figure 29 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1 or 2.

[00329] (2) The 16 DMRS ports are divided into two groups of DMRS ports, and each DMRS port group includes eight DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First:

A time-frequency resource to which the first DMRS port group is mapped includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 8 subcarrier, and a 12n + 9 subcarrier of the resource unit in the frequency domain.

A time-to-frequency resource to which the second group of DMRS ports is mapped includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n subcarrier + 10 and a 12n + 11 subcarrier of the resource unit in the frequency domain.

n can be any one or more larger integers

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117/136 or equal to 0 and less than \ _M / 12j [00330] (a) in Figure 30 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Monday:

A time-frequency resource to which the first DMRS port group is mapped includes a 2n subcarrier of the resource unit in the frequency domain.

A time-frequency resource to which the second group of DMRS ports is mapped includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

n can be any one or more integers greater than n Im / 2 | or equal to 0 and less than ^LJ .

[00331] (b) in Figure 30 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5.

[00332] (3) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the 16 DMRS ports. In this case, the 16 DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

A time-frequency resource to which the DMRS port group is mapped includes a subcarrier n of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than M.

[00333] Figure 31 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small block

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Shaded 118/136 indicates an RE to which a DMRS port group is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00334] 2. time-frequency resources to which the 16 DMRS ports are mapped include a first symbol and a second symbol of a resource unit in the time domain.

[00335] (1) The 16 DMRS ports are divided into four groups of DMRS ports, and each DMRS port group includes four DMRS ports. The four DMRS port groups include a first DMRS port group, a second DMRS port group, a third DMRS port group, and a fourth DMRS port group. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the four DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (a) in Figure 29. In this case, an example is shown in (a) in Figure 32

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (b) in Figure 29. In this case, an example is shown in (b) in Figure 32. In this solution, the ports are evenly distributed in the frequency domain and

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119/136 distributed in the two symbols, and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and it is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus implementing a joint uplink and downlink or multi transmission transmission project. -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, in this solution, a port mapping location is fixed. Therefore, this solution is more commonly used, and system indication overheads are reduced. In this solution, the ports are uniformly mapped in the frequency domain, thus facilitating flexible scheduling. In addition, power boosting or data transmission can be performed at an unoccupied door group location.

Third: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00336] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n subcarrier, a 12n + 1 subcarrier and a 12n +2 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource for which the first DMRS port group

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120/136 is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 6 subcarrier, a 12n + 7 subcarrier and a 12n +8 subcarrier from the resource unit in the frequency domain .

[00337] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4 and a 12n + 5 subcarrier of the resource unit in the frequency domain; and when a temperature-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n + 9 subcarrier, a 12n + 10 subcarrier and one 12n +11 subcarrier of the resource unit in the frequency domain.

[00338] When a time-frequency resource to which the third DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 6 subcarrier, a 12n subcarrier + 7 and a 12n + 8 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier and one resource carrier 12n + 2 in the frequency domain.

[00339] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 9 subcarrier, a subcarrier

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121/136

12η + 10 and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the fourth group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes at least one of a 12n + 3 subcarrier, a 12n + 4 subcarrier and one 12n +5 subcarrier of the resource unit in the frequency domain.

[00340] n can be any one or more integers greater than or equal to 0 and less than ^LJ .

[00341] (c) in Figure 32 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fourth: Time-frequency features to which the first and second DMRS port groups are mapped include the first symbol in the time domain, and time-frequency features to which the third and fourth DMRS port groups are mapped include the second symbol in the time domain.

[00342] When the time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource is at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 2 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier, and a 12n + 8 subcarrier of the resource unit in the frequency domain.

[00343] When the time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource is at least one of a 12n + 3 subcarrier, a 12n subcarrier

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122/136 + 4, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource domain in the frequency domain.

[00344] When the time-frequency resource to which the third DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource is at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 2 subcarrier, a 12n + 6 subcarrier, a 12n + 7 subcarrier and a 12n + 8 subcarrier of the resource domain in the frequency domain.

[00345] When the time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource is at least one of a 12n + 3 subcarrier, a 12n subcarrier + 4, a 12n + 5 subcarrier, a 12n + 9 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource domain in the frequency domain.

[00346] n can be any one or more integers greater than or equal to 0 and less than ^LJ .

[00347] (d) in Figure 32 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fifth: Time-frequency features to which the first and second DMRS port groups are mapped include the first symbol in the time domain, and time-frequency features to which the third and fourth DMRS port groups are mapped include the second symbol in the time domain.

[00348] When the time-frequency resource for which

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123/136 the first group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource is at least one of a 12n subcarrier, a 12n + 1 subcarrier, a 12n + 4 subcarrier, a 12n subcarrier + 5, a 12n + 8 subcarrier, and a 12n + 9 subcarrier of the resource unit in the frequency domain.

[00349] When the time-frequency resource to which the second group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource is at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00350] When the time-frequency resource to which the third group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource is at least one of a 12n subcarrier, a 12n + 1 subcarrier , a 12n + 4 subcarrier, a 12n + 5 subcarrier, a 12n + 8 subcarrier and a 12n + 9 subcarrier of the resource unit in the frequency domain.

[00351] When the time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource is at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00352] n can be any one or more integers _n lw / 12l greater than or equal to 0 and less than ^LJ .

[00353] (e) in Figure 32 is a schematic diagram of a

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124/136 rule for mapping the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Sixth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00354] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n + 2 subcarrier of the resource unit in the frequency domain.

[00355] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second group of DMRS ports is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n + 3 subcarrier of the resource unit in the frequency domain.

[00356] When a time-frequency resource to which the third group of DMRS ports is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 2 subcarrier of the resource unit in the frequency domain ; and when a temp frequency resource for which the third DMRS port group is

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125/136 mapped is the second symbol in the time domain, the time-frequency resource includes a 4n subcarrier of the resource unit in the frequency domain.

[00357] When a time-frequency resource to which the fourth DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 4n + 3 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the fourth DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 4n + 1 subcarrier of the resource unit in the frequency domain.

[00358] n can be any one or more integers greater than or equal to 0 and less than \ _M / 4J.

[00359] (f) in Figure 32 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1 or 2.

[00360] (2) The 16 DMRS ports are divided into two groups of DMRS ports, and each DMRS port group includes eight DMRS ports. The two groups of DMRS ports include a first group of DMRS ports and a second group of DMRS ports. The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the DMRS ports in each DMRS port group. The rules for mapping the two DMRS port groups are as follows:

First: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource to which each DMRS port group is mapped in the domain

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126/136 of the frequency, reference can be made to the solution corresponding to (a) in Figure 30. In this case, an example is shown in (a) in Figure 33

Second: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol; and for the time-frequency resource for which each DMRS port group is mapped in the frequency domain, reference can be made to the solution corresponding to (b) in Figure 30. In this case, an example is shown in (b) in Figure 33. In this solution, the doors are evenly distributed in the frequency domain and distributed in the two symbols, and have high density. This ensures accuracy of the high channel estimate in various scenarios. In addition, the doors are evenly distributed, but are mutually discrete in the frequency domain. Therefore, this solution has a low PAPR characteristic, and is applicable to both a multi-carrier transmission scenario and a single-carrier transmission scenario, thus facilitating joint design of uplink and downlink transmission or multi transmission -wave shape; and this solution is applicable to a MU-MIMO scenario, thus reducing DMRS indication overheads and system design complexity. In addition, in this solution, a port mapping location is fixed. Therefore, this solution is more commonly used, and system indication overheads are reduced. In this solution, the doors are uniformly mapped in the frequency domain, thus facilitating flexible scaling. In addition, power boosting or data transmission can be performed at a location in a group of ports

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127/136 unoccupied.

Third: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00361] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource

includes at any less an in a sub carrier 12n, an subcarrier 12n + 1, an 12n subcarrier + 4, an subcarrier 12n + 5, an 12n subcarrier + 8 and an subcarrier 12n + 9 gives resource unit in domain gives frequency; and When one time-frequency feature for the

which the first group of DMRS ports is mapped to is the second symbol in the time domain, the time-frequency feature includes at least one from a 12n + 2 subcarrier, a 12n + 3 subcarrier, a 12n + 6 subcarrier, a 12n subcarrier + 7, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain.

[00362] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes at least one of a 12n + 2 subcarrier, a 12n subcarrier + 3, a 12n + 6 subcarrier, a 12n + 7 subcarrier, a 12n + 10 subcarrier and a 12n + 11 subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes at least one from a 12n subcarrier, a 12n + 1 subcarrier, a

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128/136 subcarrier 12η + 4, one subcarrier 12n + 5, one subcarrier 12n + 8 and one subcarrier 12n + 9 of the resource unit in the frequency domain.

[00363] n can be any one or more integers _n lw / 12l greater than or equal to 0 and less than ^LJ .

[00364] (c) in Figure 33 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, and n = 0.

Fourth: A time-frequency feature to which each DMRS port group is mapped includes the first symbol and the second symbol.

[00365] When a time-frequency resource to which the first DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain; and when a time-frequency resource to which the first DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain.

[00366] When a time-frequency resource to which the second DMRS port group is mapped is the first symbol in the time domain, the time-frequency resource includes a 2n + 1 subcarrier of the resource unit in the frequency domain ; and when a time-frequency resource to which the second DMRS port group is mapped is the second symbol in the time domain, the time-frequency resource includes a 2n subcarrier of the resource unit in the frequency domain.

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129/136 [00367] n can be any one or more integers greater than or equal to 0 and less than \ _M / 2J.

[00368] (d) in Figure 33 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an RE to which a group of DMRS ports is mapped, en = 0, 1, 2, 3, 4 or 5.

[00369] (3) The same time-frequency resource is multiplexed in a CDM manner for DMRSs corresponding to the 16 DMRS ports. In this case, the 16 DMRS ports can be considered as a group of DMRS ports. The DMRS port group mapping rules are as follows:

A time-frequency resource to which the DMRS port group is mapped includes a sub-carrier n of the resource unit in the frequency domain.

n can be any one or more integers greater than or equal to 0 and less than M.

[00370] Figure 34 is a schematic diagram of a mapping rule for the 16 DMRS ports. Each small shaded block indicates an ER to which a group of DMRS ports is mapped, and n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

[00371] The above describes mainly, from a perspective of interaction between network elements, the solutions provided in the modalities of this request. It can be understood that the network elements can be, for example, base stations or terminals. To implement the above functions, the network elements include the corresponding hardware structures and / or software modules to perform the functions. A person skilled in the art should be aware that, in combination with the examples described in the modalities disclosed in this specification, the units and

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130/136 steps of the algorithm can be implemented by hardware or a combination of computer hardware and software in this application. Whether a function is performed by hardware or hardware driven by computer software depends on applications and design constraints specific to technical solutions. One skilled in the art may use different methods to implement the functions described for each particular application, but implementation should not be considered to be beyond the scope of that request.

[00372] In the modalities of this application, the division of function modules can be carried out at the base station or at the terminal based on the examples of previous methods. For example, function modules can be divided based on the corresponding functions, or two or more functions can be integrated into a processing module. The integrated module can be implemented in the form of a hardware or it can be implemented in the form of a software function module. It should be noted that the division of the module in the modalities of this application is an example and is only a division of logical function. During actual implementation, there may be other forms of division. The following provides descriptions using examples in which function modules are divided based on corresponding functions.

[00373] Figure 35 is a schematic structural diagram of an apparatus 350 for sending a DMRS. The device 350 can be the base station 100 or the terminal 200. The device 350 can include a determination unit 3501 and a sending unit 3502. The determination unit 3501 can be configured to perform Figure 6 and / or other processes used to support the technologies described in this

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131/136 specification. The sending unit 3502 can be configured to perform an action performed by the transmission end at S102 in Figure 6 and / or other processes used to support the technologies described in this specification. All the related content of the steps in the previous method modalities can be used to describe functions of the corresponding function modules, and therefore details are not described again in this document.

[00374] Figure 36 is a schematic structural diagram of a 360 device to obtain a DMRS. The apparatus 360 may include a determination unit 3601, a obtaining unit 3602 and a receiving unit 3603. The apparatus 360 may be the terminal 200 or the base station 100. The determination unit 3601 can be configured to execute S103 in Figure 6 and / or other processes used to support the technologies described in this specification. The acquisition unit 3602 can be configured to run S104 in Figure 6 and / or other processes used to support the technologies described in this specification. The 3603 receiving unit is configured to perform an action performed by the receiving end at S102 in Figure 6. All the related content of the steps in the previous method modalities can be used to describe functions of the corresponding function modules, and therefore details are not described again in this document. For example, in a specific implementation process, it can be understood that the 360 device first obtains, for example, but not limited to, a Fourier inverse transform (IFFT), a symbol carried in each RE

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132/136 (for example, obtains a symbol carried on each subcarrier and on each OFDM symbol) and then obtains a DMRS from the symbol obtained based on a time-frequency resource for which the DMRS is located.

[00375] Figure 37 is a schematic structural diagram of an indicating device. The 370 device can be the

station base 100. 0 apparatus 370 may include a unit in generation 3701 is shipping unit 3702. The unit in generation 3701 can be configured to run S201 at

Figure 6a and / or other processes used to support the technologies described in this specification. The sending unit 3702 can be configured to perform an action performed by the base station at S202 in Figure 6a and / or other processes used to support the technologies described in this specification. All the related content of the steps in the previous method modalities can be used to describe functions of the corresponding function modules, and therefore details are not described again in this document.

[00376] Figure 38 is a schematic structural diagram of an apparatus 380 for determining a temperature frequency feature. Apparatus 380 may include a receiving unit 3801 and a determining unit 3802. Apparatus 380 may be base station 100. Receiving unit 3801 is configured to perform an action performed by the receiving end at S202 in Figure 6a and / or other processes used to support the technologies described in this specification. The determination unit 3802 can be configured to run S203 in Figure 6a and / or other processes used to support the technologies described

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133/136 in this specification. All the related content of the steps in the previous method modalities can be used to describe functions of the corresponding function modules, and therefore details are not described again in this document.

[00377] In the modalities of this order, the device 350 to the device 380 are presented in a way of dividing the function modules based on the corresponding functions, or are presented in a way of dividing the function modules in an integrated way. The modules contained herein may be an application-specific integrated circuit, ASIC, a processor that runs one or more software or firmware programs and a memory, an integrated logic circuit and / or other device capable of providing the previous functions, where the processor and memory can be integrated together or independent of each other.

[00378] In a simple modality, one skilled in the art can discover that any of the apparatus 350 to the apparatus 380 is implemented by a structure shown in Figure 39.

[00379] As shown in Figure 39, a 390 device may include a 3902 memory, a 3901 processor and a 3903 communication interface. The 3902 memory is configured to store a computer executable instruction. When apparatus 390 executes, processor 3901 executes the computer executable instruction stored in memory 3902, so that apparatus 390 executes a method of transmitting information provided in an embodiment of this request. For a specific method of transmitting information, see descriptions listed in the previous and attached drawings.

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The details are not described here again. The 3903 communications interface can be a transceiver.

[00380] Optionally, device 390 can be an array of programmable field gates (field-programmable gate array, FPGA), an application-specific integrated circuit (ASIC) chip, a system on the chip (system on chip, SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP) or a microcontroller (micro controller unit , MCU), or it can be a programmable controller (programmable logic device, PLD) or another integrated chip.

[00381] An embodiment of this request also provides a means of storage. The storage medium may include memory 3902.

[00382] An information transmission device provided in a form of this request can be configured to execute the information transmission method. Therefore, for a technical effect that can be achieved by the information transmission device, consult the previous method modalities. The details are not described again in this modality of this order.

[00383] All or some of the previous modalities can be implemented using software, hardware, firmware or any combination thereof. When a software program is used to implement the modalities, all or some of the modalities can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions.

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When computer program instructions are loaded and executed by a computer, all or some of the procedures or functions described in the modalities of this application are generated. The computer may be a general purpose computer, a special purpose computer, a computer network or other programmable device. Computer instructions can be stored on a computer-readable storage medium, or they can be transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center in a wired manner (for example, a coaxial cable, an optical fiber or a digital subscriber line (digital subscriber line, DSL)) or wireless (for example, infrared, radio or microwave). The computer-readable storage medium can be any usable medium that can be accessed by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media. The usable medium can be a magnetic medium (for example, a floppy disk, a hard disk or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid state disk disk, SSD)) or the like.

[00384] Although this application is described with reference to the modalities, in an implementation process of this application that claims protection, a person skilled in the art can understand and implement other variations of the modalities

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136/136 disclosed by viewing the attached drawings, the disclosed content, and the attached claims. In the claims, understanding does not exclude another component or other steps, and one or one does not exclude a case of a plurality of. A single processor or other units can implement several functions listed in the claims. Some measures are recorded in dependent claims that are different from each other, but that does not mean that these measures cannot be combined to produce a better effect.

[00385] Although this request is described with reference to specific characteristics and their modalities, apparently, several modifications and combinations can be made to them without departing from the spirit and scope of this request. Correspondingly, that specification and the accompanying drawings are merely examples of descriptions of this application defined by the appended claims, and are considered to be any or all modifications, variations, combinations or equivalents that fall within the scope of this application. Apparently, one skilled in the art can make several modifications and variations to this order without departing from the spirit and scope of this order. Accordingly, this application is intended to cover such modifications and variations of this application, provided that these modifications and variations fall within the scope defined by the claims of the present application and equivalent technologies thereof.

Claims (8)

1. Method for sending a DMRS demodulation reference signal, characterized by the fact that it comprises: determine a time-frequency resource used to transport a DMRS; and send the DMRS by using the time-frequency feature. 2. Method for obtaining a DMRS demodulation reference signal, characterized by the fact that it comprises: determine a time-frequency resource used to transport a DMRS; and obtain the DMRS by using the time-frequency resource. 3. Indication method, characterized by the fact that it comprises: generate referral information, where referral information is used to indicate a time-frequency resource used to carry a DMRS demodulation reference signal; and send the referral information. 4. Method for determining a time-frequency resource, characterized by the fact that it comprises: receiving referral information, where referral information is used to indicate a time-frequency resource used to carry a DMRS demodulation reference signal; and determining the time-frequency resource based on referral information. 5. Apparatus for sending a DMRS demodulation reference signal, characterized by the fact that it comprises: a unit of determination, configured to determine a time-frequency resource used to transport a Petition 870190098203, of 10/01/2019, p. 151/192 2/2 DMRS; and a sending unit, configured to send the DMRS by using the time-frequency feature. 6. Apparatus for obtaining a DMRS demodulation reference signal, characterized by the fact that it comprises: a determination unit, configured to determine a time-frequency resource used to transport a DMRS; and a procurement unit, configured to obtain the DMRS by using the time-frequency resource. 7. Indication device, characterized by the fact that it comprises: a generation unit, configured to generate indication information, where indication information is used to indicate a time-frequency resource used to carry a DMRS demodulation reference signal; and a sending unit, configured to send referral information. 8. Apparatus for determining a temperature frequency feature, characterized by the fact that it comprises: a receiving unit, configured to receive indication information, where indication information is used to indicate a time-frequency resource used to carry a DMRS demodulation reference signal; and a determination unit, configured to determine the time-frequency resource based on the indication information.